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Wang J, Yuan Z, Cui Y, Xie R, Yang G, Kassab MA, Wang M, Ma Y, Wu C, Yu X, Liu X. Molecular basis for the inhibition of the methyl-lysine binding function of 53BP1 by TIRR. Nat Commun 2018; 9:2689. [PMID: 30002377 PMCID: PMC6043480 DOI: 10.1038/s41467-018-05174-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Accepted: 06/14/2018] [Indexed: 11/09/2022] Open
Abstract
53BP1 performs essential functions in DNA double-strand break (DSB) repair and it was recently reported that Tudor interacting repair regulator (TIRR) negatively regulates 53BP1 during DSB repair. Here, we present the crystal structure of the 53BP1 tandem Tudor domain (TTD) in complex with TIRR. Our results show that three loops from TIRR interact with 53BP1 TTD and mask the methylated lysine-binding pocket in TTD. Thus, TIRR competes with histone H4K20 methylation for 53BP1 binding. We map key interaction residues in 53BP1 TTD and TIRR, whose mutation abolishes complex formation. Moreover, TIRR suppresses the relocation of 53BP1 to DNA lesions and 53BP1-dependent DNA damage repair. Finally, despite the high-sequence homology between TIRR and NUDT16, NUDT16 does not directly interact with 53BP1 due to the absence of key residues required for binding. Taken together, our study provides insights into the molecular mechanism underlying TIRR-mediated suppression of 53BP1-dependent DNA damage repair.
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Affiliation(s)
- Jiaxu Wang
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China
| | - Zenglin Yuan
- State Key Laboratory of Microbial Technology, Shandong University, Jinan, 250100, Shandong, China
| | - Yaqi Cui
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA
| | - Rong Xie
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA
| | - Guang Yang
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA
| | - Muzaffer A Kassab
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA
| | - Mengxi Wang
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China
| | - Yinliang Ma
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA
| | - Chen Wu
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China
| | - Xiaochun Yu
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 East Duarte Road, Duarte, CA, 91010, USA.
| | - Xiuhua Liu
- College of Life Sciences, Hebei University, Baoding, 071000, Hebei, China.
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